How to check the cause of eccentric wear of old cylinder liner?
Time:
2021-09-15
When using a car in daily life, the phenomenon of eccentric wear of the old cylinder liner will often occur. Next, let's talk about how to check the eccentric wear of the old cylinder liner.
When using a car in daily life, the phenomenon of eccentric wear of the old cylinder liner will often occur. Next, let's talk about how to check the eccentric wear of the old cylinder liner.
First, assemble the piston connecting rod group without piston rings on the crankshaft according to the standard requirements, and rotate the crankshaft to the top dead center, bottom dead center and middle of the cylinder liner at the three positions of the engine piston, respectively. Measure the clearance between the front and rear of the cylinder and the top of the piston. If the distances between the three clearances are approximately equal, it can be proved that the cylinder liner does not have eccentric wear; otherwise, it can be inferred that the cylinder liner eccentric wear has occurred.
Generally speaking, cylinder eccentric wear has the following situations:
At the upper, middle and lower positions of a certain cylinder liner, the above-mentioned gaps are all too small on one side. This situation indicates that the connecting rod itself is bent, which in turn causes the axes of both ends of the connecting rod to be non-parallel, so that in the movement During the process, the connecting rod is always deflected, which makes the cylinder liner wear more seriously at the top and bottom dead centers of the piston. In addition, the connecting rod will also bend multiple times (double bending). At this time, the axes of the large and small end holes of the connecting rod are in the same plane, but the axis of the piston is biased, causing serious wear on one side of the cylinder liner.
The piston does not deflect at the top and bottom dead centers, but it deflects to one side in the middle. The reason for this failure is generally that the connecting rod is twisted, which causes the axes of the holes at both ends of the connecting rod to be out of the same plane, which eventually causes the wear of the middle of the cylinder to exceed the wear of the upper and lower dead centers.
The simultaneous occurrence of bending and twisting of the connecting rod causes partial wear of the cylinder liner. It can be determined by observing the gap between the front and rear of the piston top. If the gap is irregular, it can be explained that it is the result of the simultaneous action of the two. In view of this kind of failure, we must pay attention to both when repairing, in order to restore its normal function.
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